As the weather warms up here in Oklahoma, the flying insects are coming out. I noticed some jello effect on my last flight, SOOO.. I inspected the props to discover that I have been chopping various insects into a million peices throughout my flights. I almost never take the props off because I can transport fully ready to fly. The props were covered (on the bottom) with bug guts and was throwing the props off balance. Gave them a good scrubbing down, and all is good now!.. Your warmer weather I1 tip from Oklahoma!